Brainstorm

A genius scientist and diabolical inventor, Brainstorm develops advanced weaponry for the Autobots. Although many of his inventions are deemed too devastating to use in actual combat, it's possible his laboratory itself is his most dangerous creation. Brainstorm frequently ignores proper safety protocols, and an unwary visitor to his lab runs a high risk of triggering some half-finished doomsday weapon. In spite of this, he is allowed to continue his work, proof of just how valuable Brainstorm is to the Autobot cause.

Revealed in a leak on Hasbro's customer service website in late October 2013.

This Brainstorm is a Headmaster, his head detaches to transform into his old partner Arcana who can sit in the cockpit of the vehicle mode. In robot mode when Arcana is attached he causes the tech spec display to pop down.